Linear solenoid actuator for an exhaust gas recirculation valve

Assignee: Motors Liquidation Co

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Filing: 1995-08-16

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Granted: —

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Expires: 2015-08-16

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Abstract

Abstract A valve assembly (16) is disclosed for metering exhaust gas to the intake manifold (180) of an internal combustion engine (12). the valve assembly has a base (22) which includes a passage (44) communicating between the intake manifold and the exhaust manifold of the engine. The passage has a valve seat (52) which is operable with a valve member (94) to meter the flow of exhaust gas through the passage to the intake manifold. An actuator assembly (18) is mounted to the base and is operably connected to the valve member to move the valve member into and out of engagement with the valve seat. The actuator assembly includes a solenoid (116) having a magnetic circuit comprising stationary primary (118) and secondary (134) pole pieces and a movable armature (146). The primary pole piece includes a cylindrical tapered pole piece (120) and a tapered extension (162). The pole piece tapered outwardly with respect to the actuator axis and the extension tapered inwardly. A tapered armature portion (160) having an angle coinciding with the angle of the pole piece extension operates to focus leakage flux between the armature and the tapered pole piece while the armature and tapered extension provide force tailoring characteristics through an additional degree of design freedom available through the additional, and variable second air gap.

Inventors

👤 Raul Armando Bircann
👤 Dwight Orman Palmer
👤 Thomas Wolfgang Nehl
👤 Noreen Louise Mastro

Bibliographic Details

Application Number —

Jurisdiction EP

Data Source google_patents

Last Synchronized 2026-11-06 19:55

CPC Classifications

F; F02; F02M; F02M26/00; F02M26/45; F02M26/48; F02M26/52; F02M26/53

Claims Analysis

Total Claims: 3

Claim 1

Independent Claim 179 words

A valve assembly for metering exhaust gas to the intake of an internal combustion engine comprising an electromagnetic solenoid actuator having a magnetic circuit comprising stationary primary and secondary pole pieces and an armature moveable along an axis of said actuator, said primary pole piece including a cylindrical pole tapered outwardly with respect to the axis of said actuator and a pole piece extension, tapered inwardly with respect to the axis of said actuator, and said armature including a tapered portion at a first end adjacent to said cylindrical tapered pole, said armature taper angled in an inward direction with respect to the axis of the actuator and at an angle substantially similar to that of said pole piece extension, said angled armature and tapered cylindrical pole operable to focus leakage flux from said armature to said tapered cylindrical pole to thereby increase the axial force acting on said armature and said angled armature and angled extension operable as an air gap when said armature approaches a fully opened position thereby increasing the axial force operable on said armature.

Claim 2

Dependent Claim 93 words

A valve assembly for metering exhaust gas to the intake of an internal combustion engine, as defined in claim 1, further comprising a valve member movable between a fully closed and a fully opened position by said armature, said primary pole piece comprising a cup shaped housing including said cylindrical pole tapered outwardly with respect to the axis of said actuator, said pole piece extension tapered inwardly with respect to the axis of said actuator, a base portion and a cylindrical outer wall, said cup shaped housing configured to receive a coil therein.

Claim 3

Dependent Claim 300 words

A valve assembly for metering exhaust gas to the intake of an internal combustion engine comprising a valve member moveable between a fully opened and a fully closed position by an electromagnetic solenoid actuator having a magnetic circuit which comprises stationary primary and secondary pole pieces and an armature, operably attached to said valve member and moveable, along an axis of said actuator, between said primary and secondary pole pieces, said primary pole piece comprising a cup shaped housing including an inner cylindrical pole tapered outwardly with respect to the axis of said actuator, a pole piece extension tapered inwardly with respect to the axis of said actuator, a base portion and a cylindrical outer wall, said cup shaped housing configured to receive a coil therein, said secondary pole piece comprising a cylindrical pole and a flanged member extending outwardly therefrom and configured to close said cup shaped primary pole piece, said inner cylindrical pole of said primary pole piece and said cylindrical pole of said secondary pole piece aligned coaxially to define a cylindrical passage for axial movement of said armature, said armature including a tapered portion at a first end adjacent to said cylindrical tapered pole, said taper angled in an inward direction relative to the axis of said actuator and at an angle substantially the same as that of said pole piece extension, said angled armature and tapered cylindrical pole operable to focus flux from said armature to said tapered cylindrical pole to thereby increase the force acting on said armature in the axial direction of the actuator to open said valve, and said angled armature and said angled extension operable to define an air gap when said armature approaches a fully open position thereby increasing the axial force operable on said armature to open said valve.

References Cited (Backward Citations)

US5020505A Cited

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